Wall-wash flange



y 1 3 J, VAN DER WERF 1,957,742

WALL WASH FLANGE Original Filed July 1929 Patented May 8, 1934 UNITEDWALL JVASH FLANGE Application July 12, 1929, Serial No. 377,681 RenewedMay 23, 1932 ATES PATENT FFHCE 5. chamber.

5o chamber.

6 Claims.

This invention relates to improvements in a wall-wash flange, and hasfor its principal object the provision of means for obstructing the pathof a fluid introduced into a closed receptacle, direct- 5 ing the flowof the fluid to the walls of the receptacle, and imparting to the saidfluid a swirling motion as the same impinges upon the said walls.

In the distillation of hydrocarbon oils, and particularly in crackingprocesses, a receptacle or 10 container is utilized commonly known tothe art as a reaction or expansion chamber. The charging stock is firstpassed under pressure through a heating zone, usually a continuous tube,wherein the charging stock is raised to the cracking temperature. Theheated oil is then conducted to the so-called reaction or expansionchamber, usually an enclosed cylindrical vessel disposed vertically. Ingeneral practice, the oil enters at the top of the chamber through aconventional pipe, no nozzle or the like being used.

Later a wall-wash flange was disposed at the discharge end of the pipe,and comprised a blind flange bolted against another flange of the samediameter which was screwed on the transfer line 2 extension. Bothflanges were kept at a distance from each other of approximately 7 orthereabout, by means of two bolts passing through both flanges andpreferably disposed diametrically opposite each other.

3 The purpose of the wall wash flange above described is to provide ameans for discharging the oil from the heating coil into the chamber insuch a manner that the non-vaporized oil is caused to run in a thin filmalong the inner walls of the Although it is not known with certaintywhat causes the beneficial result obtained by the use of this feature,it has been found that a lower amount of coke forms both in the chamberand in the residuum from the process, for an equal quantity of raw oiltreated, than with the use of the common method of discharging the oilinto the upper part of the chamber without providing any means for thedirection and distribution of the stream of hot oil discharging in thechamber.

Practice has shown that the above described flanges have been verysuccessful. However, in some instances, strips of hard coke were foundand had to be removed from the walls of the Incidentally, these cokestrips were found directly opposite the two connecting bolts.

Accordingly, one of the objects of the present invention is to impart tothe fluid admitted to the chamber a swirling, turbulent motion when thesame impinges upon the walls of the chamber,

thus preventing a dead or motionless spot of liquid upon any portion ofthe wall. More particularly, a series of vanes or curved fins are provided between the two flanges of the wall wash device, whereby thedischarged fluid is caused to leave the flanges at an angle other than90 to the periphery of the flanges, and likewise impinges upon the wallsof the chamber an angle other than 90 thereto. Hence, the formation orthe above mentioned strips of coke is eliminated and consequentlycleaning of the reaction chamberto remove these strips is not necessary,yet all the advantages of the wall wash flange are obtained.

Other and further important objects or" the present invention will beapparent from the accompanying drawing, and the following description.

In the drawing, Fig. 1 is a vertical elevation of a reaction chamber,parts being broken away, '35 and other parts shown in section,illustrating particularly the positioning of the flange within thechamber.

Fig. 2 is a transverse section taken on line 2-2 of Fig. 1, looking inthe direction of the so arrows.

Fig. 3 is a sectional view, taken on the line 3-3 of Fig. 2, looking inthe direction of the arrows.

As shown in the drawing, 1 indicates generally a receptacle such as areaction chamber or the like, having residuum outlet lines 2 controlledby valves 3.

A transfer line 6 enters the chamber at the top thereof and is adaptedto deliver oil from a suitable heating zone (not shown). In the chamber,vapors separate from unvaporized oil; the latter may be withdrawnintermittently or continuously from the bottom of the chamber 1 througheither or both of the lines 2. The withdrawal of the non-vaporized oilfrom the chamber may be controlled to maintain any level in chamber 1,but 1 preferably regulate such withdrawal so that a very low level ismaintained, for instance, about a foot of oil maintained in the bottomof chamber 1 above the lowermost point.

The vapors separated in the chamber 1 are withdrawn therefrom through aline 7, contro led by valve 8. The vapor draw-ofi line '2 may preferablyextend into the inside of chamber 1 by means of an extension 7a, whichterminates in the lower part of chamber 1 and near the verti cal axisthereof. The point of withdrawal of vapors from the chamber can bechanged, according to the results desired and the conditions Oil ofoperation, by changing the length of the extension line 7a. An auxiliaryvapor line '7, controlled by valve 8, may be provided.

Referring particularly to Figs. 1 and 3, a flange 9 may be threadedlymounted upon the end or the transfer line 6 within the chamber 1. Aplurality of bolts 10 are provided to fasten a blind flange 11 to theflange 9, there being a spaced relation between the two flanges,dependent upon the diameter of the chamber 1 and the pressure andquantity of fluid passing through the line 6. Positioned between the twoflanges 9 and 11 are a plurality of vanes 12 disposed substantiallyspirally in a plane at right-angles to the flow of the fluid in the pipe6. It is apparent that fluid passing through the pipe 6 under pressurewill be directed outwardly by the blades 12 at an angle other than 90 tothe periphery of the flanges and hence will be directed toward the wallsof the chamber 1 at an angle thereto other than 90. Hence, all parts ofthe wall of the chamber 1 will be sprayed by the fluid, and the stripsof carbon aforementioned will be eliminated.

Although the embodiment of this invention is shown and described inconnection with a reaction chamber, it is not to be understood that Iwish to be limited by this specific showing, since various situationsexist wherein a device of this character may be used.

My invention, in addition to efliciently performing its function, ischaracterized by the ease with which it may be assembled anddisassembled. This feature is particularly important, in view of thefact that it is subject to coke deposition and must be accessible forcleaning purposes.

It may also be mentioned that the space between the flanges may bevaried by varying the depth of the vanes, and if desired the device maybe constructed as a unitary structure, by welding the vanes to theflanges, thereby eliminating the use of the retaining bolts.

I claim as my invention:

1, In combination with a vapor separating chamber of an oil crackingsystem, a hot oil inlet pipe extending into and terminating adjacent theupper portion of said chamber, a non-rotatable flange fixed to the endof said pipe, an imperforate baffle beneath, spaced from and fixed'tosaid flange, vanes between said flange and bafile and disposedsubstantially spirally in a plane at right angles to the direction offlow of oil through said inlet pipe, a residual oil outlet adjacent thelower portion of said chamber, and means for separately removing vaporsfrom said chamber.

2. In combination with a vapor separating chamber of an oil crackingsystem, a hot oil inlet pipe extending into and terminating adjacent theupper portion of said chamber, a non-rotatable flange fixed to the endof said pipe, an imperforate bafiie beneath, spaced from and fixed tosaid flange, vanes between said flange and baflie and disposedsubstantially spirally in a plane at right angles to the direction offlow of oil through said inlet pipe, a residual oil outlet adjacent thelower portion of said chamber, a vapor outlet pipe for said chamberterminating adjacent the lower portion thereof.

8. In combination with a vapor separating chamber of an oil crackingsystem, a hot oil inlet pipe extending into and terminating adjacent theupper portion of said chamber, a non-rotatable flange fixed to the endof said pipe, an imperiorate baiiie beneath, spaced from and flxed tosaid flange, vanes between said flange and bafile and disposedsubstantially spirally in a plane at right angles to the direction offlow of oil through said inlet pipe, a residual oil outlet adjacent thelower portion of said chamber, a vapor outlet pipe for said chamberterminating adjacent the lower portion thereof, and an auxiliary vaporoutlet pipe communicating with the upper portion of said chamber.

4. In combination with an enlarged reaction chamber of an oil crackingsystem, a hot oil inlet pipe extending downwardly into and terminatingadjacent the upper portion of said chamber, a non-rotatable flange fixedto the end of said pipe, an imperforate bafiie beneath, spaced from andfixed to said flange, said flange and baiile being disposedsubstantially at right angles to the direction of discharge or" oil fromsaid pipe, means between said flange and bafile for imparting a swirlingmotion to the hot oil discharging from said inlet pipe, and means forremoving vapors and residual oil from the chamber.

5. In combination with an enlarged reaction chamber of an oil crackingsystem, a hot oil inlet pipe extending downwardly into and terminatingadjacent the upper portion of said chamber, a non-rotatable flange fixedto the end of said pipe, an imperforate baflle, bolts extending throughsaid flange and baiile and securing the flange and baifle together inspaced parallel relation, said flange and baflle being disposedsubstantially at right angles to the direction of discharge of oil fromsaid pipe, means between said flange and battle for imparting a swirlingmotion to the hot oil discharging from said inlet pipe, and means forremoving vapors and residual oil from the chamber.

6. In combination with an enlarged reaction chamber of an oil crackingsystem, a hot oil inlet pipe extending downwardly into and terminatingadjacent the upper portion of said chamber, a flange secured to saidpipe adjacent the end thereof, an imperforate baffle beneath and spacedfrom said flange, said flange and battle being disposed substantially atright angles to the direction of discharge of oil from said pipe,non-rotatable means associated with said flange and baflle for impartinga swirling motion to the hot oil discharging from said pipe, and meansfor removing vapors and residue from the chamber.

JAN VAN DER WERF.

